JP2001192173A - Bobbin fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive bobbin fixing device capable of decreasing the number of parts, eliminating a mechanical trouble, and preventing galling of a shaft and a claw. SOLUTION: This bobbin fixing device has a bobbin shaft having an inclined surface, the screw shaft screw-engaged with the bobbin shaft to relatively rotate axially, and the claw elongated in the axial direction to the bobbin shaft so that the inclined surfaces come into contact with each other. The claw is axially engaged with the screw shaft to relatively rotate in the circumferential direction and links with the screw shaft through a female-male flange axially engaged to relatively rotate in the circumferential direction by machining to a circumferential continuous key form, whereby the claw can co-operate with the screw shaft, so that galling of a sliding part between the shaft and the claw can be prevented, and the structure can be simplified to eliminate a mechanical trouble. The inclined surfaces of the bobbin shaft are respectively formed in three equally circumferential divided positions thereof, and these inclined surfaces are provided with the claw.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft-based bobbin fixing device for a bobbin as a wire winding device.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional bobbin fixing device. Reference numeral 1 denotes a screw, 2 denotes a thrust ball bearing, 3 denotes a compression spring, 4 denotes a slide piece, 5 denotes a claw holding pin, 6 Is a compression spring, 7 is a pawl, 8 is a bobbin shaft, 9
Is a bobbin, and 10 is a dedicated handle.

The screw 1 is supported in a shaft 8 by thrust bearings 2 and 2, and a reverse screw is formed on each end of the shaft 8. A slide piece 4 is screwed into each screw. Each of the slide pieces 4, 4 has an inclined surface 4a that is downwardly outward. The pawl 7 is set on the slide pieces 4 and 4 while aligning its own inclined surface 7 a so that its outer surface can protrude outside the shaft 8. Therefore, the screw 1 is connected to the special handle 1
When the slide pieces 4 and 4 are rotated in one direction (rightward) at 0, the slide pieces 4 and 4 are moved toward the end of the shaft 8, and the claws 7 contacting the slide pieces 4 and 4 with inclined surfaces are pushed up outward. Then, the pawl 7 presses the bobbin 9 from the inner trunk side, so that the bobbin 9 is fixed. Conversely, when the screw 1 is rotated in the other direction (left direction), the push-up of the claw 7 is released, and the fixing of the bobbin 9 is released. The compression spring 6 and the claw pressing pin 5 are provided to prevent the claw 7 from falling.

FIG. 3 shows another example of a conventional bobbin fixing device. Reference numeral 11 denotes a screw, 12 denotes a bearing metal, 13 denotes an Ixpel, 14 denotes a claw, 15 denotes a claw holding plate,
16 is a leaf spring, 17 is a slide metal, and 18 is a bobbin shaft.

The Ixpel 13 is incorporated in the shaft 18 so as to be slidable only in the axial direction (not to be rotated), and has an inclined surface 13a which rises to the back (to the right). ing. Screw 12 is
The shaft 18 is supported on the near side via the bearing metal 12, and the propulsion end is screwed into the Ixpel 13. The claw 14 is in contact with the inclined surface 13 a of the Ixpel 13 via the slide metal 17, and the outer portion can protrude outside the shaft 18. Therefore, when the screw 11 is rotated in one direction (to the right) by the special handle 10, the Ixpel 13 is rotated by the shaft 18.
Of the Ixpell 13
The pawl 14 that contacts the slide metal 17 is pushed up outward, and the bobbin 9 is pressed from the inner trunk side by the pawl 14 to fix the bobbin 9. Conversely, screw 1
When 1 is rotated in the other direction (to the left), the Ixpel 13 is pulled in front of the shaft 18 and the push-up of the claw 14 is released, so that the bobbin 9 is released from being fixed. The leaf spring 16 presses the claw 14 against the Ixpel 13, so that the slide metal 17 and the Ixpel 13 are kept in contact with each other and slide with each other. Nail holding plate 15
Are provided to prevent the nail 14 from dropping.

[0006]

In the bobbin fixing device shown in FIG. 2, the following problems are found. (1) The thrust ball bearing 2 receiving the screw 1 must be lubricated. (2) Refueling grease scatters during rotation of the bobbin and contaminates the product. (3) Since the top 4 for pushing up the claw has a two-point structure, the balance between both ends of the bobbin retainer tends to be lost. (4) As is clear from FIG. 2, the structure is complicated, and play is likely to occur in each part.

The following problems are found in the bobbin fixing device shown in FIG. (1) Galling occurs because the Ixpel 13 and the bobbin shaft 18 are in full contact. (2) Since the slide metal 17 is used for the sliding portion of the claw 14, metal wear and play are likely to occur. (3) There are restrictions on the dimensions of the portion where the metal of the claw enters and the portion where the leaf spring enters, so that their thickness is reduced and they are easily broken by repeated loads. (4) The structure is such that play is likely to occur in the screwed portion of the screw 11 and the IX spell 13, and the IX spell is likely to malfunction. (5) FIG.
It is a special structure and expensive as shown by.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive bobbin fixing device which can reduce the number of components to eliminate mechanical troubles, prevent galling between a shaft and a claw, and can reduce the number of components.

[0009]

According to the present invention, there is provided a bobbin fixing device comprising: a bobbin shaft having an inclined surface; a screw shaft screwed rotatably relative to the bobbin shaft; A claw extending in the axial direction so that the inclined surfaces contact each other, and the claw is axially engaged with the screw shaft so as to be relatively rotatable in a circumferential direction, whereby the screw shaft is engaged with the screw shaft. The pawl can cooperate with the screw shaft, thereby preventing galling of the sliding portion between the shaft and the pawl, and at the same time, simplifying the structure to eliminate mechanical trouble.

It is preferable that the inclined surfaces of the bobbin shaft are formed at three equally spaced positions in the circumferential direction, and that these inclined surfaces are provided with claws.

[0011] An end of the screw shaft and an end of the claw are linked via a male / female flange axially engaged so as to be relatively rotatable in the circumferential direction by a keying process that is continuous in the circumferential direction. And good.

[0012]

FIG. 1 shows an embodiment of a bobbin fixing device according to the present invention in a state where it is mounted on a bobbin.

The bobbin fixing device of this embodiment has a bobbin 9
Are formed in the bobbin shaft 22 to be loaded in the body of the body at a position where the groove having the bottom surface of the inclined surface 22a which rises to the back (rises to the right) is divided into three in the circumferential direction (only one position in the drawing) The bobbin shaft 22 is provided with a screw shaft 19 and the inclined surface 22a; three claws 20 corresponding to the grooves (only one is shown in the drawing).

The screw shaft 19 is supported by a bearing metal on the front side of the bobbin shaft 22, and a propulsion end is screwed into the bobbin shaft 22. On the front side, a ring-shaped female flange 19a is formed integrally with the front side and has a ring-shaped key that is continuous in the circumferential direction.

The claw 20 is an elongated member extending into the groove of the bobbin shaft 22, and has an inclined surface 2 of the bobbin shaft.
An inclined surface 20a is formed corresponding to 2a, and the pawl 20 is slidable in the axial direction of the bobbin shaft 22 by the mutual contact of the inclined surfaces 22a, 20a.

The claw 20 has a male flange 23 on its front side.
To engage with the female flange 19a. Reference numeral 24 denotes a bolt for connecting and fixing the male flange 23 to the claw 20.
The male flange 23 has a key shape that matches the key-formed surface of the female flange 19a, whereby the male flange 23 can rotate relative to the female flange 19a in the circumferential direction. It is designed to engage only in the axial direction.

Now, as shown in FIG. 1, the screw shaft 1 is set on the bobbin 9 with a special handle 10.
When the screw shaft 9 is rotated in one direction (to the right), the screw shaft 19 is screwed into the bobbin shaft 22 in the axial direction, and the pawl 20 linked to the screw shaft 19 so as to be rotatable relative to the screw shaft 19 is rotated together with the screw shaft 19. 22, and the pushed claw 20 is pushed outward by sliding between the inclined surfaces with the bobbin shaft 22.
Presses against the body of the bobbin 9 from the inner surface, so that the bobbin 9 is fixed.

On the other hand, when the screw shaft 19 is rotated in the other direction (to the left), the screw shaft 19 retreats, and at the same time the claw 20 retreats, so that the fixing to the bobbin 9 is released.

Reference numeral 21 denotes a nail holding pin, and the nail 20
It is provided to prevent falling.

According to the bobbin fixing device of the present embodiment having such a structure and operation, the pawl and the bobbin shaft are prevented from galling by operating the pawl in cooperation with the screw shaft. Further, as is clear from FIG. 1, since the structure has fewer parts than the conventional device (FIGS. 2 and 3), a mechanical trouble is reduced and an inexpensive device can be realized. In particular, by simplifying the structure, it is possible to provide a bobbin fixing device that can support a high-speed rotating bobbin.

[0021]

As described above, according to the present invention, it is intended to provide an inexpensive bobbin fixing device in which the number of parts is reduced to eliminate mechanical troubles, to prevent galling between the shaft and the pawl, and to provide an inexpensive bobbin fixing device. The problem is: the objective can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional explanatory view showing a bobbin fixing device according to an embodiment of the present invention in a state where the bobbin is attached to a bobbin.

FIG. 2 is an explanatory cross-sectional view showing an example of a conventional bobbin fixing device attached to a bobbin.

FIG. 3 is an explanatory sectional view showing another example of the conventional bobbin fixing device in a state where the bobbin fixing device is attached to a bobbin.

[Explanation of symbols]

 19 Screw shaft 19a Female flange 20 Claw 20a Inclined surface 21 Claw holding pin 22 Bobbin shaft 22a Inclined surface 23 Male type flange 24 Bolt

Claims (3)

[Claims] 1. A bobbin shaft having an inclined surface, a screw shaft screwed relative to the bobbin shaft so as to be rotatable relative to the bobbin shaft, and an axially extending so as to contact the bobbin shaft with the inclined surfaces. The claw is axially engaged with the screw shaft so as to be rotatable in a circumferential direction, whereby the claw can cooperate with the screw shaft. Bobbin fixing device. 2. The bobbin fixing device according to claim 1, wherein the inclined surfaces of the bobbin shaft are formed at positions equally divided into three in the circumferential direction, and claws are provided on these inclined surfaces. 3. An end portion of the screw shaft and an end portion of the claw are linked via a male / female flange axially engaged with the end portion of the claw being rotatable relative to the circumferential direction by a circumferentially continuous key-shaped process. The bobbin fixing device according to claim 1 or 2, wherein the bobbin fixing device is provided.